feat: use dlcdn with archive as fallback (#6)

action.yml

@@ -23,7 +23,7 @@ inputs:
   rat-version:
     description: |
       Apache Creadur RAT Version
-      See Apache archives for available versions.
+      See Apache dlcdn or archives for available versions.
       e.g. 0.15, 0.14, ...
     required: false
     default: 0.16.1
@@ -42,7 +42,21 @@ runs:
       shell: bash
       working-directory: ${{ github.action_path }}
       run: |
-        curl --no-progress-meter https://archive.apache.org/dist/creadur/apache-rat-${{ inputs.rat-version }}/apache-rat-${{ inputs.rat-version }}-bin.tar.gz --output apache-rat-${{ inputs.rat-version }}-bin.tar.gz
+        set +e
+        # Try Apache's Download CDN
+        echo "Attempting to download from Apache's Download CDN"
+        curl --fail --silent --no-progress-meter https://dlcdn.apache.org/creadur/apache-rat-${{ inputs.rat-version }}/apache-rat-${{ inputs.rat-version }}-bin.tar.gz --output apache-rat-${{ inputs.rat-version }}-bin.tar.gz
+
+        if [ $? -ne 0 ]; then
+          # It is possible that a new version was released and last version removed from dlcdn.
+          echo "Attempting to download from Apache's Archive"
+          curl --no-progress-meter https://archive.apache.org/dist/creadur/apache-rat-${{ inputs.rat-version }}/apache-rat-${{ inputs.rat-version }}-bin.tar.gz --output apache-rat-${{ inputs.rat-version }}-bin.tar.gz
+
+          if [ $? -ne 0 ]; then
+            echo "Failed to download Apache RAT"
+            exit 1
+          fi
+        fi
         tar zxf apache-rat-${{ inputs.rat-version }}-bin.tar.gz
 
     - name: Run Apache Creadur RAT with ratignore